Delei Li in #8: General Questions on September 13 (#fa1b261)

in #8: General Questions

<p> Preparing forcing data: Convert ERA5 pressure levels data to model levels with hybrid coordinate </p> <p> Dear all, </p> <p> I am downscaling ERA5 reanalysis to a higher resolution by using the CCLM regional climate model for the latest month (August. 2023- ).  Since only pressure vertical coordinates from ERA5 are available for the latest month (the model levels data with hybrid coordinates are usually three months delayed), I need to convert the pressure level data to hybrid coordinates, which is required for driving CCLM. </p> <p> Does anyone know how to do it? Do I need to consider the topography when we make the conversion? Furthermore, I noticed that there is a function pres2hybrid from NCL ( <a class="external-link" href="https://www.ncl.ucar.edu/Document/Functions/Built-in/pres2hybrid.shtml" rel="noopener noreferrer" target="_blank"> https://www.ncl.ucar.edu/Document/Functions/Built-in/pres2hybrid.shtml </a> ),  maybe it works? (not sure, I am trying ...) </p> <p> Any help on this matter will be highly appreciated. </p> <p> Best regards, </p> <p> Delei </p>

  @deleili in #fa1b261

<p> Preparing forcing data: Convert ERA5 pressure levels data to model levels with hybrid coordinate </p> <p> Dear all, </p> <p> I am downscaling ERA5 reanalysis to a higher resolution by using the CCLM regional climate model for the latest month (August. 2023- ).  Since only pressure vertical coordinates from ERA5 are available for the latest month (the model levels data with hybrid coordinates are usually three months delayed), I need to convert the pressure level data to hybrid coordinates, which is required for driving CCLM. </p> <p> Does anyone know how to do it? Do I need to consider the topography when we make the conversion? Furthermore, I noticed that there is a function pres2hybrid from NCL ( <a class="external-link" href="https://www.ncl.ucar.edu/Document/Functions/Built-in/pres2hybrid.shtml" rel="noopener noreferrer" target="_blank"> https://www.ncl.ucar.edu/Document/Functions/Built-in/pres2hybrid.shtml </a> ),  maybe it works? (not sure, I am trying ...) </p> <p> Any help on this matter will be highly appreciated. </p> <p> Best regards, </p> <p> Delei </p>
DL wrote

Preparing forcing data: Convert ERA5 pressure levels data to model levels with hybrid coordinate

Dear all,

I am downscaling ERA5 reanalysis to a higher resolution by using the CCLM regional climate model for the latest month (August. 2023- ).  Since only pressure vertical coordinates from ERA5 are available for the latest month (the model levels data with hybrid coordinates are usually three months delayed), I need to convert the pressure level data to hybrid coordinates, which is required for driving CCLM.

Does anyone know how to do it? Do I need to consider the topography when we make the conversion? Furthermore, I noticed that there is a function pres2hybrid from NCL ( https://www.ncl.ucar.edu/Document/Functions/Built-in/pres2hybrid.shtml ),  maybe it works? (not sure, I am trying ...)

Any help on this matter will be highly appreciated.

Best regards,

Delei

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